EP0491962B1 - Composition de resine et article d'optique fabrique avec cette derniere - Google Patents

Composition de resine et article d'optique fabrique avec cette derniere Download PDF

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Publication number
EP0491962B1
EP0491962B1 EP91912459A EP91912459A EP0491962B1 EP 0491962 B1 EP0491962 B1 EP 0491962B1 EP 91912459 A EP91912459 A EP 91912459A EP 91912459 A EP91912459 A EP 91912459A EP 0491962 B1 EP0491962 B1 EP 0491962B1
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EP
European Patent Office
Prior art keywords
neodymium
resin composition
acid
beads
composition according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91912459A
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German (de)
English (en)
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EP0491962A4 (en
EP0491962A1 (fr
Inventor
Kozo Tokyo Research Laboratories Ida
Tetsuya Tokyo Research Laboratories Suda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Rayon Co Ltd
Original Assignee
Mitsubishi Rayon Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2183329A external-priority patent/JP2558930B2/ja
Priority claimed from JP2184478A external-priority patent/JP2648224B2/ja
Application filed by Mitsubishi Rayon Co Ltd filed Critical Mitsubishi Rayon Co Ltd
Publication of EP0491962A1 publication Critical patent/EP0491962A1/fr
Publication of EP0491962A4 publication Critical patent/EP0491962A4/en
Application granted granted Critical
Publication of EP0491962B1 publication Critical patent/EP0491962B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0041—Optical brightening agents, organic pigments
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/16—Solid spheres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2227/00—Photographic printing apparatus
    • G03B2227/32—Projection printing apparatus, e.g. enlarging apparatus, copying camera
    • G03B2227/325—Microcapsule copiers

Definitions

  • neodymium compounds absorb light selectively in the vicinity of the wavelength of 580 nm.
  • first publication Sho 58-225148 discloses an selective light absorptive resin compounds where neodymium oxide powder is dispersed in a transparent plastic base material, such as methacrylic resin, and optical products making use thereof.
  • first publication Sho 60-161458 discloses neodymium-containing transparent resin compounds obtained by polymerizing a mixture of monomers such as alkyl (meth)acrylate and styrene, neodymium compounds such as neodymium acrylate, a carboxylic acid as a solvent of this neodymium compound and a polymerization initiator by the cell-cast method and optical products making use thereof.
  • optical products have the characteristic of selectively absorbing light in range of wave length 580 nm, and are used in filters of color display equipment, such as color CRT, screen boards, lenses and lighting equipments.
  • the resin composition of this invention has superior light selective functions because it is a formation of a resin composition where beads having light selective function arising from introducing a neodymium compound into a transparent polymer are dispersed in the transparent optical product, and furthermore does not show a decrease in the light selective function even when the neodymium content is raised.
  • Figure 2 is a spectrum showing the spectral characteristics of a resin sheet attained by the preferred embodiment of the present invention.
  • the beads with light selective function used in the present invention are particles in which a neodymium compound is introduced into a transparent polymer.
  • the particle size of these beads lies in the range of 0.01 »m and 5 mm. This particle size may suitably be chosen according to the use of the beads.
  • the neodymium compound within the beads having an light selective function can be chemically bonded to transparent polymers by such means as copolymerization, or also can be dissolved in transparent polymers. But, it is necessary that the beads themselves are transparent.
  • neodymium compound used in the present invention can be uniformly dispersed in the transparent polymer, any compound can be used, and if the neodymium compound is chemically bonded to a transparent polymer, polymerizable unsaturated neodymium carboxylate can be used. If chemically bonding is not necessary, one type or a mixture of two or more types of the following may be used: neodymium carboxylates, neodymiun salts of mono alkyl phosphate, and aliphatic or aromatic neodymium salts of sulfonic acid which are all unpolymerizable.
  • the polymerizable neodymium compound and the monomer for forming a transparent polymer can be suspension copolymerized to form a uniform mixture, or the monomer for forming a transparent polymer may be suspension polymerized in a condition that the non-polymerizable neodymium compound is uniformly dispersed within the monomer to form a polymer.
  • a polymerizable unsaturated neodymium carboxylate is used.
  • Neodymium salts of polymerizable unsaturated carboxylic acids include neodymium (meth)acrylate, neodymium acrylate, neodymium ⁇ -chloro acrylate, neodymium ⁇ -ethyl (meth)acrylate, neodymium maleate, neodymium fumarate or neodymium itaconate.
  • Neodymium salts of non-polymerizable carboxylic acids which can be used include salts of saturated fatty acids such as propionic acid, n-butynic acid, iso-butynic acid, n-valeric acid, iso-valeric acid, n-capronic acid, n-caprylic acid, n-capric acid, ⁇ -ethyl hexanoic acid, lauric acid and stearic acid; or neodymium salts of non-polymerizable unsaturated fatty acids and aromatic carboxylic acids such as oleic acid, linoleic acid, linolenic acid, recinoleic acid, benzoic acid, phtalic acid, succinic acid, naphthenic acid, maleic acid, itaconic acid, mono alkyl ester itaconate; or neodymium salts of oxo-carboxylic acids such as levulinic acid or acety
  • Neodymium salts of phosphoric acids include the neodymium salts of monoalkyl phosphate such as monobutyl phosphate or monoethyl phosphate.
  • neodymium salts can also react with carboxylic acid forming a double salt which can be suitably used.
  • carboxylic acid forming a double salt which can be suitably used.
  • carboxylic acids that are used include, for example, polymerizable unsaturated carboxylic acids such as methacrylic acid and acrylic acid, as well as non-polymerizable carboxylic acids such as propionic acid, isobutyric acid, n-butyric acid, caproic acid, capric acid, 2-ethylhexanoic acid, stearic acid, octanoic acid and naphthenic acid.
  • carboxylic acids can either be used separately or can be used as a mixture of two or more carboxylic acids.
  • the neodymium salt, to be used in forming the double salt is a salt of a unpolymerizable acid
  • a polymerizable unsaturated carboxylic acid be used.
  • the percent ratio of the carboxylic acid is preferably within the range of 10-40% by weight. If the percent weight of the carboxylic acid exceeds 40%, not only is the neodymium weight content inside of the beads possessing light selective function decreased, but the mechanical and technical properties of the aforementioned beads are also decreased.
  • the formation of the double salt from a neodymium salt and a carboxylic acid is carried out by first adding the neodymium salt and the carboxylic acid to the polymerizable monomer, then agitating and mixing. The process is completed either at room temperature or by heating this mixture to a temperature of 100°C or less, for 0.5 - 5 hours while agitating.
  • saturated aliphatic alcohols such as propanol and cyclohexanol as well as polyatomic alcohols such as, ethylene glycol, diethylene glycol and propylene glycol can be used at the same time in order to further increase the solubility of the double salt formed from the neodymium salt and the carboxylic acid.
  • the percent weight of the mixture when taken as a mixture with the carboxylic acid, based on a total of 100% by weight of the mixture plus the neodymium salt, the percent weight of the mixture is preferably between 10-40% by weight: within the mixture, the preferred condition is one in which the carboxylic acid is 10% or greater by weight with the alcohol being 10% or less, and most preferably 5% or less, by weight.
  • (Meth)acrylic ester and styrene are typical polymerizable monomers for transparent polymers.
  • Methacrylic esters include alkyl (meth)acrylates such as methyl (meth)acrylate and ethyl (meth)acrylate as well as cyclohexyl (meth)acrylate, tetrahydrofuryl (meth)acrylate, benzyl (meth)acrylate, phenyl (meth)acrylate, allyl (meth)acrylate, methallyl (meth)acrylate, ⁇ -naphtyl (meth)acrylate, ⁇ -aminoethyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, ⁇ -hydroxyethyl (meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, 1,4-butane diol di(meth)acrylate, 1,6-hexane dio
  • a copolymerizable monomer can be used as long as the transparency of the beads possessing light selective function is not hurt.
  • copolymerizable monomers include compounds such as vinyl acetate, acrylonitrile and methacrylonitrile.
  • the mixed solution obtained in this manner is then suspension polymerized, and the desired beads possessing light selective function are thus obtained.
  • this suspension polymerization a process is being employed in which the above mentioned polymerizable mixed solution as well as a polymerization initiator are suspended in an ordinary water phase.
  • Polymerization initiators which are being employed include azobis groups such as ⁇ , ⁇ '-azobisisobutyronitrile ⁇ , ⁇ '-azobis-2,4-dimethyl valeronitrile and ⁇ , ⁇ '-azobis-2,4-dimethyl-4-methoxy valeronitrile.
  • polymerization initiators can be used separately or in combination thereof.
  • the usage amount based on a total of 100 parts by weight of the polymerizable components in the above mentioned mixed solution, is 0.001 - 1 parts by weight.
  • protective colloids such as polyvinyl alcohol, carboxymethyl cellulose, sodium polyacrylate, gelatin and alginic acid can also be suitably added.
  • Preferred conditions for polymerization include a process in which the temperature ranges over 30-90°C for 1-10 hours; however, the conditions are not limited just to these ranges, as processes in which polymerization is carried out first at low temperature and then continued at increasing temperature, can also be employed.
  • the neodymium compound is introduced either in a solid or in a dissolved state, the bead bodies become transparent. Additionally, due to the presence of the neodymium compound there is optical absorption in the vicinity of 580 nm: as well, a sharp and high absorptivity is observed as a result of of the neodymium compound being in a solid or dissolved state. Furthermore, in the bead bodies, since mechanical characteristics and such are not particularly required, the neodymium content can be sufficiently increased, for example, up to approximately 15% by weight. Additionally, by appropriately varying the polymerization conditions, beads of various particle sizes can be obtained. By changing such factors as the composition ratio of various types of additives such as polymerizable monomers, neodymium salts and carboxylic acids, the index of refraction of the beads can be varied according to the uses.
  • the beads possessing light selective function obtained in this manner are added and dispersed in various transparent resin compositions to obtain the resin composition of the present invention.
  • the transparent resin composition if transparency is displayed, the following can be used independent of whether thermal plasticity or thermal setting characteristics are shown: polymethyl (meth)acrylate, polystyrene, polyvinyl chloride, acrylonitrile styrene copolymers, polycarbonate, and cellulose plastics.
  • transparent optical products can be obtained when the refractive index of the beads and the refractive index of the transparent resin composition to form a matrix are made identical. Additionally, when the size of the beads is 0.2 »m or less, even though the indexes of refraction are different, a good transparency can still be obtained. Furthermore, in the case of adding beads with a particle size of approximately 0.5 - 2 mm, optical products exhibit a granulated surface, while optical products with beads having a particle size of approximately 50 - 100 »m display a frosted or opaque (semi-transparent) surface. As well, the optical products with an opaque surface can also be obtained when such photoscattering agents as titanium oxide, talc, and barium sulfate are used together with the beads and transparent resin composition.
  • photoscattering agents as titanium oxide, talc, and barium sulfate are used together with the beads and transparent resin composition.
  • the amount of the beads possessing light selective function added to the transparent resin composition is influenced by both the neodymium content of the beads as well as the uses of the molded articles of the optical products but, generally speaking the range is approximately 2 - 30 parts by weight, per 100 parts by weight of the transparent resin composition. Due to the structure of the beads containing the neodymium compound, there is no lowering of the mechanical properties in the molded article of the optical products, and thus, as a result, a large quantity of the neodymium can exist in the final optical product. Consequently, both the light selective function of the neodymium can be fully exhibited and almost no decrease in the mechanical properties of the optical products as the final product is exhibited.
  • coloring agents such as pigments and dyes can be also be used to produce a colored resin composition.
  • coloring agents by blending the coloring agents having at least one light absorption band in the wavelength of 380 - 420 nm, 480 - 530 nm, 560 - 610 nm and 640 - 780 nm, but having a small or no absorption band in the wavelength range of the visible light other than above mentioned wavelength range to the neodymium compound, selective light absorption by the neodymium compound can be made up, or, selective absorption can be carried out in the visible light range where the above mentioned neodymium compound shows no absorption.
  • Coloring agents used in this manner include, the dyes, pigments and ultraviolet absorption agents listed below.
  • Coloring agents which principally absorb light in the 380 - 420 nm wavelength region include: salicylic esters such as phenyl salicylate and para-tert-butylphenyl salicylate, benzotriazoles such as 2-(2'-hydroxy-5'-methylphenyl) benzotriazole and 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chloro benzotriazole, and benzophenones such as 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-chloro benzophenone, and 2,2'-dihydroxy-4-octoxybenzophenone.
  • salicylic esters such as phenyl salicylate and para-tert-butylphenyl salicylate
  • benzotriazoles such as 2-(2'-hydroxy-5'-methylphenyl) benzotriazole and 2-(2'-hydroxy-3',5'-di-tert-butylphen
  • coloring agents there are no compounds found which, as coloring agents, principally absorb light in the 560 - 610 nm wavelength region, however, among the coloring agents which principally absorb light in the above mentioned three regions, those coloring agents which also absorb light in the 560 - 610 nm wavelength region are preferred for use: these agents include, for example, Euvinil blue-702 (produced by BASF A.G.).
  • the resin composition used together with the above types of coloring agents is able to absorb red, green and blue light as well as light outside of these three primary colors.
  • the color purity of emission from a fluorescent element as well as the color reproduction property are improved, and while maintaining a high luster, the contrast is also prevented from decreasing.
  • the beads having light selective function were manufactured in accordance with the following.
  • the polymer was dehydrated, rinsed and dried by conventional procedures and transparent globular beads were obtained. These beads were then classified in a pneumatic micro separator and beads with the desired particle sizes were obtained.
  • the casting mold was dipped in 70°C water for 80 minutes and the polymerization was completed by placing the mold in a 130°C air bath for 80 minutes. The mold was then removed, and the optical characteristics and spectral transmittance curve of the casted sheet were as shown in table 2 and figure 1.
  • the casted sheet obtained in this manner optical diffusivity and a strong absorption in the 580 nm wavelength vicinity can be observed.
  • this type of casted sheet is used in incandescent electric light bulb covers and in halogen lamp covers, color rendering effects are increased, and so, the casted sheet is useful in lighting equipment.
  • cast sheets were manufactured either by the same cast polymerization process as described in example 1 (in examples 10, 11 and comparative examples 2, 3), or by the same extruding process described in example 7 (in example 12).
  • uniformly dispersed neodymium containing beads were present in the sheets of all of the examples; on the other hand, neodymium was not contained in any of the comparative examples.
  • these resin sheets were interposed between on one hand, a metal sheet possessing a lenticular mold in which lenticule units of 0.4 mm of pitch and 0.29 mm of R (radius of curvature) and 0.3 mm of pitch and 0.07 mm or R are arraied alternatively and on the other hand, a metal sheet with a mirrored surface.
  • the sheet was heated under a temperature of 180°C and formed in a heat press machine (molding pressure 25 kg/cm2, molding time 15 minutes): lenticular type projection screens were thus obtained.
  • the resin composition of the present invention contains beads containing a large amount of neodymium compounds and so possessing light selective functions which show sharp absorption pattern in the vicinity of 580 nm in the transparent resin composition. Additionally, all of the optical products of the present invention, because they can be obtained from the above mentioned resin composition, possess superior light selective characteristics and have a sufficiently high neodymium content with no lowering of mechanical properties.

Abstract

Composition de résine qui absorbe sélectivement la lumière d'une bande de longueur d'onde d'environ 580 nm, préparée en dispersant dans une composition de résine transparente des perles à absorption sélective de la lumière comprenant un composé de néodyme contenu dans un polymère transparent. Si on compare cette composition à une composition comprenant un composé de néodyme directement dispersé dans une résine transparente, on peut ajouter une plus grande quantité du composé de néodyme sans altérer les caractéristiques mécaniques et thermiques de la composition de résine.

Claims (9)

  1. Composition de résine caractérisée en ce que des perles possédant une fonction de sélection de la lumière, constituées d'un polymère transparent renfermant un dérivé du néodyme, sont dispersées dans une résine transparente.
  2. Composition de résine selon la revendication 1, pour laquelle le diamètre de particule des perles possédant la fonction de sélection de la lumière n'est pas inférieur à 0,01 »m et pas supérieur à 5mm.
  3. Composition de résine selon la revendication 1, pour laquelle le dérivé du néodyme est constitué d'un ou plusieurs des composés suivants: un carboxylate de néodyme insaturé polymérisable, un carboxylate de néodyme non polymérisable, un monoalkylphosphate de néodyme, un sel de néodyme d'un acide sulfonique aliphatique et un sel de néodyme d'un acide sulfonique aromatique.
  4. Composition de résine selon la revendication 3, pour laquelle le dérivé du néodyme est un carboxylate de néodyme.
  5. Composition de résine selon la revendication 4, pour laquelle le dérivé du néodyme est un sel double constitué d'un sel de néodyme et d'un acide carboxylique.
  6. Composition de résine selon la revendication 1, pour laquelle les perles possédant une fonction de sélection de la lumière sont dispersées à raison de 2 à 30 parties en poids pour 100 parties en poids de la résine transparente.
  7. Composition de résine selon la revendication 1, pour laquelle le polymère transparent est un polymère d'un ester méthacrylique ou de styrène.
  8. Composition de résine selon la revendication 7, pour laquelle le polymère transparent est un copolymère d'un ester méthacrylique ou de styrène et d'un ou plusieurs monomères choisis parmi l'acétate de vinyle, l'acrylonitrile et le méthacrylonitrile.
  9. Articles d'optique formés à partir de la composition de résine selon la revendication 1.
EP91912459A 1990-07-11 1991-07-10 Composition de resine et article d'optique fabrique avec cette derniere Expired - Lifetime EP0491962B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP183329/90 1990-07-11
JP2183329A JP2558930B2 (ja) 1990-07-11 1990-07-11 光選択機能性樹脂組成物
JP2184478A JP2648224B2 (ja) 1990-07-12 1990-07-12 光学フィルターなどの光学製品
JP184478/90 1990-07-12
PCT/JP1991/000922 WO1992001020A1 (fr) 1990-07-11 1991-07-10 Composition de resine et article d'optique fabrique avec cette derniere

Publications (3)

Publication Number Publication Date
EP0491962A1 EP0491962A1 (fr) 1992-07-01
EP0491962A4 EP0491962A4 (en) 1993-01-13
EP0491962B1 true EP0491962B1 (fr) 1995-12-13

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Application Number Title Priority Date Filing Date
EP91912459A Expired - Lifetime EP0491962B1 (fr) 1990-07-11 1991-07-10 Composition de resine et article d'optique fabrique avec cette derniere

Country Status (5)

Country Link
US (1) US5306746A (fr)
EP (1) EP0491962B1 (fr)
KR (1) KR100190205B1 (fr)
DE (1) DE69115456T2 (fr)
WO (1) WO1992001020A1 (fr)

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US5696187A (en) * 1994-01-21 1997-12-09 Mitsubishi Gas Chemical Company, Inc. Methyl methacrylate-styrene copolymer resin composition sheet
US6767927B1 (en) * 1999-04-26 2004-07-27 Rhodia Rare Earths Inc. Synthesis of stable solutions of rare earth tris (organophosphate) in hydrocarbon solvents
US7393623B2 (en) * 2001-06-06 2008-07-01 Spectra Systems Corporation Incorporation of markings in optical media
US20060293425A1 (en) * 2003-08-26 2006-12-28 Japan Science And Technology Agency Method for producing functional polyimide fine particle and rewritable memory material utilizing change in fluorescence characteristics caused in fluorescence characteristics caused by light irradiation or heat treatment
US7407998B2 (en) * 2004-09-28 2008-08-05 Arkema France Stabilized UV transparent acrylic composition
US20060074161A1 (en) * 2004-09-28 2006-04-06 Shi-Jun Yang Stabilized UV transparent acrylic composition
US8770749B2 (en) 2010-04-15 2014-07-08 Oakley, Inc. Eyewear with chroma enhancement
WO2013070417A1 (fr) 2011-10-20 2013-05-16 Oakley, Inc. Oculaire ayant une agglomération de chromie
WO2013169987A1 (fr) 2012-05-10 2013-11-14 Oakley, Inc. Lunettes à couches fonctionnelles stratifiées
US9575335B1 (en) 2014-01-10 2017-02-21 Oakley, Inc. Eyewear with chroma enhancement for specific activities
CN104932191B (zh) * 2014-03-18 2017-01-11 无锡视美乐激光显示科技有限公司 一种提高显示图像颜色饱和度的屏幕和方法
CN207704150U (zh) 2014-11-13 2018-08-07 奥克利有限公司 具有颜色增强的可变光衰减眼睛佩戴件
US11112622B2 (en) 2018-02-01 2021-09-07 Luxottica S.R.L. Eyewear and lenses with multiple molded lens components

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US4471078A (en) * 1982-06-21 1984-09-11 Mitsubishi Rayon Company, Ltd. Process for preparation of selective light absorptive methacrylic resins
JPS58225148A (ja) * 1982-06-21 1983-12-27 Mitsubishi Rayon Co Ltd 光選択吸収性樹脂組成物
JPS59217705A (ja) * 1983-05-25 1984-12-07 Kyowa Gas Chem Ind Co Ltd ネオジム含有透明樹脂およびその製造方法
DE3375150D1 (en) * 1982-07-30 1988-02-11 Kyowa Gas Chem Ind Co Ltd Neodymium-containing transparent resin and method for manufacture thereof
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Publication number Priority date Publication date Assignee Title
JPH05158444A (ja) * 1991-12-04 1993-06-25 Canon Inc 液晶表示装置
JPH0665050A (ja) * 1992-08-20 1994-03-08 Shiseido Co Ltd 皮膚外用剤

Also Published As

Publication number Publication date
KR920702395A (ko) 1992-09-03
EP0491962A4 (en) 1993-01-13
KR100190205B1 (ko) 1999-06-01
DE69115456T2 (de) 1996-06-05
US5306746A (en) 1994-04-26
DE69115456D1 (de) 1996-01-25
WO1992001020A1 (fr) 1992-01-23
EP0491962A1 (fr) 1992-07-01

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